Hi Anshu0012,
To start, a 620 is a strong initial CAT score (the average score on the Official GMAT hovers around 550 most years). In addition, the
MGMAT CATs are generally regarded as being a little tougher than the Official GMAT, so your performance here be even stronger than the 620 score implies. That having been said, with just one Score, we can't say for sure what your actual 'ability level' is right now, but you clearly have some really solid Quant and Verbal skills.
Before I can offer you any additional advice for your studies, it would help if you could provide a bit more information on how you've been studying and your goals:
Studies:
1) How long have you studied? How many hours do you typically study each week?
2) What study materials have you used so far?
Goals:
3) What is your overall goal score?
4) When are you planning to take the GMAT?
5) When are you planning to apply to Business School and what Schools are you planning to apply to?
GMAT assassins aren't born, they're made,
Rich